服务集群。Envoy 通过负载均衡 策略决定将请求路由到哪个集群成员。 xDS 协议的主要概念： • Listener Discovery Service (LDS) : 监听器发现服务。 • Route Discovery Service(RDS) : 路由发现服务。 • Cluster Discovery Service (CDS)： 集群发现服务。 • Endpoint Discovery Service 6 Istio 流量管理 – 数据面 – Istio 中的 Envoy Sidecar 配置 Istio中的 Envoy Sidecar 配置： • Istio 通过 Listener、Route Config 和 Cluster 为 Mesh 中的 Envoy 生成了入向和出向两个不同方向的处理流程的配 置。 • 在 Envoy 的基础上增加了 VirtualInboundListene outbound listener。 5. 根据 0.0.0.0_9080 listener 的 http_connection_manager filter 配置，该请求采用 9080 route 进行分发。 6. 9080 这个 route 的配置中，host name 为 reviews:9080 的请求对应 的 cluster 为 outbound|9080||reviews.default.svc.cluster

Istio灰度发布：基于权重 apiVersion: … kind: VirtualService metadata: name: vs-svcb spec: hosts: - svcb http: route: - destination: name: v1 weight: 20 - destination: name: v2 weight: 80 Version2 Envoy SVC Envoy VirtualService metadata: name: ratings-route spec: hosts: - svcb http: - match: - headers: cookie: exact: “group=dev” route: - destination: name: v1 - route: - destination: name: v224 灰度发布：灰度版本存在形式 “/newcatalog” }, “route”: [ { "destination": { "name": "reviews", "subset": "v2" }, "weight": 25 }, { "destination": { "name": "reviews", "subset": "v3" }, "weight": 75 } ] }, { “route”: [ { "destination":

`DROP TABLE ABC`,则至少需要填入`DROP TABLE`. 16. # skip-sqls = ["ALTER USER", "CREATE USER"] 17. 18. ## 在使用 route-rules 功能后， 19. ## replicate-do-db & replicate-ignore-db 匹配合表之后(target-schema & target-table )数值 20 60. #[[route-rules]] 61. #pattern-schema = "route_*" 62. #pattern-table = "abc_*" 63. #target-schema = "route" 64. #target-table = "abc" 65. 66. #[[route-rules]] 67. #pattern-schema = "route_*" 68. #pattern-table #pattern-table = "xyz_*" 69. #target-schema = "route" 70. #target-table = "xyz" 71. 72. [from] 73. host = "127.0.0.1" 74. user = "root" 75. password = "" 76. port = 3306 77. 78. [to] 79. host = "127

2016CppCon 2023 40 David Olsen - Back to Basics: Concurrency STD::TRANSFORM_REDUCE route_cost find_best_route(int const* distances, int N) { return std::transform_reduce(std::execution::par, ng>(0L), counting_iterator(factorial(N)), route_cost(), route_cost::min, [=](long i) { int cost = 0; route_iterator it(i, N); int from = it.first(); it.next(); cost += distances[from*N + to]; from = to; } return route_cost(i, cost); }); } Traveling salesman David Olsen, “Faster Code Through Parallelism or CPUs

Arguments route_cost find_best_route(int const* distances, int N) { return std::transform_reduce(std::execution::par, counting_iterator(0L), counting_iterator(factorial(N)), route_cost(), route_cost::min route_cost::min, [=](long i) { int cost = 0; // ... calculate cost ... return route_cost(i, cost); }); }92 David Olsen – Generic Programming CppCon 2024 Constraints93 David Olsen – Generic Programming

APP 去中心化网关架构 LB spanner APP1 Logic Logic API Gateway Jar APP2 Logic Logic API Gateway JS Route 特点： • 干掉形式上的网关 • 轻路由前置到 LB • 业务集成网关 Jar • 业务之间互不干扰 • NodeJS 版 缺点： • 接入困难（几十个 jar 依赖） • Jar 版本维护成本高 30+系统、70-80%流量11/21 Mesh 化网关架构（2018-2019) APP Mesh 化网关架构 LB spanner APP1 Logic Logic Route MOSN APP2 Logic Logic MOSN APP3 Logic Logic MOSN • 低成本接入 • 平滑升级 • 异构支持 • 核心系统上云12/21 蚂蚁金服

are used in multi-cluster environments to route traffic between clusters hosting the same application. ● Tier-2 Gateways sit at the cluster edge and route traffic to the mesh- managed services inside

HTTPMessageDelegate for a given request and RequestHandler. Here is a simple example of how we can we route to RequestHandler subclasses by HTTP method: resources = {} class GetResource(RequestHandler): interface adds the ability to distinguish between the routes and reverse them to the original urls using route’s name and additional arguments. Application is itself an implementation of ReversibleRouter class r", Handler)])), ])) ]) server = HTTPServer(router) In the example below RuleRouter is used to route between applications: app1 = Application([ (r"/app1/handler", Handler1), # other handlers ... ])

concern to make C++xx for it or its dependents? Proposal for DG advisory ● WGs SGs decide on TS or IS route and write proposal supporting direction ● The key question: ○ WHAT ARE we hoping to LEARN through their supporting reasons ● DG will offer non-binding advisory in some cases as ○ whether TS or IS route is preferred, or have you considered an SG ○ In some cases an SG vs TS vs IS continuum needs to be

HTTPMessageDelegate for a given request and RequestHandler.Here is a simple example of how we can we route to RequestHandler subclasses by HTTP method: resources = {} class GetResource(RequestHandler): interface adds the ability to distinguish between the routes and reverse them to the original urls using route’s name and additional arguments. Application is itself an implementation of ReversibleRouter class Handler)])), ])) ]) server = HTTPServer(router) In the example below RuleRouter is used to route between applications: app1 = Application([ (r"/app1/handler", Handler1), # other handlers